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Updated: June 17, 2025
But as these valves are placed in vessels, which are indued with life, and are themselves indued with life also; and are very irritable into those natural motions, which absorb, or propel the fluids they contain; it is possible, in some diseases, where these valves or vessels are stimulated into unnatural exertions, or are become paralytic, that during the diastole of the part of the vessel to which the valve is attached, the valve may not so completely close, as to prevent the relapse of the lymph or chyle.
Their enormous liquid masses, fleeing ceaselessly from the equator, govern a vast assemblage of water from the poles that comes to occupy their space, and these chilled and fresher currents are constantly precipitating themselves on the electric hearth of the equator that warms and salts them anew, renewing with its systole and diastole the life of the world.
He knew that the pulsatile force was resident in the walls of the heart and in the arteries, and he knew that the expansion, or diastole, drew blood into its cavities, and that the systole forced blood out.
For if in those fevers the arteries do not expand themselves in their diastole to more than half the usual diameter of their diastole in health, the fibres which constitute their coats, will move through a less space in a minute than in health, though they make two pulsations for one.
Thus, if any person on a light day looks on a white wall, he may perceive the ramifications of the optic artery, at every pulsation of it, represented by darker branches on the white wall; which is evidently owing to its compressing the retina during the diastole of the artery. Savage Nosolog.
He, therefore, traced the interchange of light-values in colourless after-images to a 'silent resistance which every vital principle is forced to exhibit when some definite condition is presented to it. Thus, inhalation presupposes exhalation; thus every systole, its diastole.
No one, before his time, conceived that the movement of the blood was entirely due to the mechanical action of the heart as a pump. There were all sorts of speculations about the matter, but nobody had formed this conception, and nobody understood that the so-called systole of the heart is a state of active contraction, and the so-called diastole is a mere passive dilatation.
An appetite, a feeling and a love That had no need of a remoter charm By thought supplied. Is this systole and diastole of the affection from sense to spirit, from spirit to sense, peculiarly characteristic of English poets? There may be some reason for assuming that it is.
Conceive a state of communication between the centre and the extremities of a great people, kept up with a uniformity of reciprocation so exquisite as to imitate the flowing and ebbing of the sea, or the systole and diastole of the human heart; day and night, waking and sleeping, not succeeding to each other with more absolute certainty than the acts of the metropolis and the controlling notice of the provinces, whether in the way of support or of resistance.
This prolonged rest or diastole of the heart allows the circulation in the coronary arteries to become normal, and the nutrition and muscle tone of the heart improves. Digitalis also increases the blood pressure, not only by improving the activity of the heart, but also by causing some contraction of the arterioles.
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